冒泡算法的三种JavaScript表示

     以前学习冒泡算法,总是弄不清楚n和n-1等一些变量的关系,原因是没有弄明白它的真正含义,今天写了一个冒泡算法的JS小程序,终于弄明白了。
     
var R1=new Array();
R1[
1]=35;
R1[
2]=55;
R1[
3]=65;
R1[
4]=20;
R1[
5]=30;
R1[
6]=25;
R1[
7]=0;
R1[
8]=7;
R1[
9]=5;
R1[
10]=3;
var R2=new Array(35,55,65,20,30,25,0,7,5,3);
var R3=new Array(35,55,65,20,30,25,0,7,5,3);

function BubbleSort1()
{
    
var n=R1.length-1;
    
for(var i=1;i<n;i++)
    {
        
var flag=false;
        
for(var j=n-1;j>=i;j--)
        {
            
var temp;
            
if(R1[j+1]<R1[j])
            {
                temp
=R1[j+1];
                R1[j
+1]=R1[j];
                R1[j]
=temp;
            }
            flag
=true;
        }
        
if(!flag) return;        
    }
}

function BubbleSort2()
{
    
var n=R2.length;
    
for(var i=0;i<n-1;i++)
    {
        
var flag=false;
        
for(var j=n-2;j>=i;j--)
        {
            
var temp;
            
if(R2[j+1]<R2[j])
            {
                temp
=R2[j+1];
                R2[j
+1]=R2[j];
                R2[j]
=temp;
            }
            flag
=true;
        }
        
if(!flag) return;        
    }
}
function BubbleSort3()
{
    
var n=R3.length;
    
for(var i=0;i<n-1;i++)
    {
        
var flag=false;
        
for(var j=n-1;j>i;j--)
        {
            
var temp;
            
if(R3[j]<R3[j-1])
            {
                temp
=R3[j];
                R3[j]
=R3[j-1];
                R3[j
-1]=temp;
            }
            flag
=true;
        }
        
if(!flag) return;        
    }
}
    调用它们的HTML文件代码如下:
   
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
    
<head>
        
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
        
<title>BubbleSort</title>
        
<script language="javascript" src="bubblesort.js"></script> 
        
<script language="javascript">
           BubbleSort1();
           BubbleSort2();
           BubbleSort3();
           
for(var z=1;z<11;z++)
           {
                document.write(R1[z]);
             
           }
           document.write(
"<br/>");
           
for(var k=0;k<10;k++)
           {
                document.write(R2[k]);
                  
           }
           document.write(
"<br/>");
           
for(var k=0;k<10;k++)
           {
                document.write(R3[k]);
        
           }
        
</script>
    
</head>
    
<body>
    
</body>
</html>
posted @ 2006-11-20 18:12  大天使泰瑞尔  阅读(965)  评论(2编辑  收藏  举报